Commercial Services and System Repairs

Basic Components

This commercial HVAC system consists of a network of variable refrigerant flow zoning (VRFZ) technology along with the advanced CITY MULTI Controls Network (CMNC). The system consists of the following components:

  • An outdoor unit
  • Up to 32 indoor units
  • A main controller (typically, a branch circuit (BC) controller for the R-2 series and a manifold for the Y-series units)
  • Zone controllers
  • Software

Superior Heating and Cooling

The CITY MULTI system perfectly balances energy efficiency with distributing the necessary amount of capacity between the indoor units. In fact, the capacity of the R-2 Series can be up to 150% of the capacity of the outdoor unit due to the load diversity of the different zones and the system’s ability to heat and cool at the same time.


The CITY MULTI whole building system doesn’t need ducts. Instead, it uses refrigerant lines, which give a lot of design flexibility; this system can work with both new and existing buildings. You don’t have to compromise ceiling height with ductwork and the installation process is a lot simpler.

The lightweight outdoor unit boasts a small footprint for easy placement on roofs, in tight alleyways, on ledges, and or in other small spots. Additionally, the indoor units come in a variety of styles including wall-mounted, floor-mounted, ceiling-concealed, suspended, or recessed to work with almost any design objectives.

Thanks to the system’s modular design, it can be installed zone by zone. That means you don’t have to shut down the whole building for installation, and you don’t even have to convert the whole building all at once.

Zone Cooling

With zone cooling, you can control each area separately, which promotes efficiency and helps you lower the bills in your building. To make this possible, each indoor unit has an electronic expansion valve. That allows the area to get the exact amount of heating or cooling that it needs.

With the G-50A controller, you can manage up to 50 indoor units from a single controller. Using TG-2000 software or a Local Area Network (LAN) and Internet Explorer, you can manage up to 40 G-50A controllers from a single location, which allows you to control up to 2,000 individual units at once. For total control of your whole building, you can sync the CITY MULTI system to your Building Management System (BMS) using LonWorks® or BACnet®.

If you have residential or business tenants, you can let them manage their own zones, and you can set parameters to prevent misuse. With the TG-2000 software, you can also monitor the usage of individual units and generate bills for each tenant.

Quiet Systems

Ideal for schools, libraries, offices, recording studios, and multiple other spaces, CITY MULTI indoor units operate at about 24 decibels on low to 47 decibels on high. That’s about the same noise level as a whisper or rustling tree leaves. The outdoor unit operates at about 56 decibels, which is about as loud as an electric toothbrush or a dishwasher from the next room.

Healthy Ventilation

Often overlooked, the ventilation component of HVAC systems is critical to indoor air quality. With the CITY MULTI, Lossnay Energy Recovery Ventilators (ERVs) bring in outside air and manage energy recovery. That makes your building a healthier overall environment. On top of that, you don’t have to worry about dust or debris building up in the ductwork and potentially degrading indoor air quality.

Easy Maintenance

Owning the system is also designed to be relatively worry-free with easy maintenance. With ductless systems, you don’t have to clean any ducts. Additionally, the outdoor unit has a diagnostic display, and the four-digit fault code makes it easy to troubleshoot potential issues. We can also set you up with a service program, where our technicians come to your facility and perform routine maintenance to keep the system running as efficiently as possible and to help you avoid emergency HVAC repairs.

When you’re looking for a whole building HVAC solution, we can help. Our HVAC technicians can assist you in choosing, installing, and setting-up the best system for your needs. For large commercial buildings, apartment blocks, office parks, and similar spaces where you need efficient, quiet, ductless heating and cooling that can be independently controlled in different zones, CITY MULTI is usually the perfect solution. To learn more or to get a quote, contact N.E.T.R., Inc. at 781-933-NETR.

Comfort and Savings For Your Bottom Line

With innovative INVERTER and expansion-valve technology, Mitsubishi Electric Cooling & Heating systems consistently perform at 25% higher efficiency than traditional systems. More efficiency equals more savings on energy costs!

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